Lt. Gen. Mary Legere, Head of Army Intelligence, Is Leading Candidate for DIA Post

WASHINGTON—The head of the Defense Intelligence Agency will step down this year, after a tenure pushing for broad changes in how military intelligence is collected and used, the Defense Department said.

During his two years at the helm, Lt. Gen. Michael Flynn has led an overhaul of the DIA, which provides intelligence to the Pentagon and regional commands on terrorism and foreign militaries. Both at the DIA and earlier in his career,...